/*
 * $Id$
 *
 *
 * SQUID Web Proxy Cache          http://www.squid-cache.org/
 * ----------------------------------------------------------
 *
 *  Squid is the result of efforts by numerous individuals from
 *  the Internet community; see the CONTRIBUTORS file for full
 *  details.   Many organizations have provided support for Squid's
 *  development; see the SPONSORS file for full details.  Squid is
 *  Copyrighted (C) 2001 by the Regents of the University of
 *  California; see the COPYRIGHT file for full details.  Squid
 *  incorporates software developed and/or copyrighted by other
 *  sources; see the CREDITS file for full details.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 */

#ifndef SQUID_CLIENTSIDE_H
#define SQUID_CLIENTSIDE_H

#include "comm.h"
#include "StoreIOBuffer.h"
#include "BodyPipe.h"
#include "RefCount.h"
#include "base/AsyncJob.h"
#include "CommCalls.h"

class ConnStateData;

class ClientHttpRequest;

class clientStreamNode;

class AuthUserRequest;

class ChunkedCodingParser;
class HttpParser;

template <class T>
class Range;

class ClientSocketContext : public RefCountable
{

public:
    typedef RefCount<ClientSocketContext> Pointer;
    void *operator new(size_t);
    void operator delete(void *);
    ClientSocketContext();
    ~ClientSocketContext();
    bool startOfOutput() const;
    void writeComplete(int fd, char *bufnotused, size_t size, comm_err_t errflag);
    void keepaliveNextRequest();
    ClientHttpRequest *http;	/* we own this */
    HttpReply *reply;
    char reqbuf[HTTP_REQBUF_SZ];
    Pointer next;

    struct {

        unsigned deferred:1; /* This is a pipelined request waiting for the current object to complete */

        unsigned parsed_ok:1; /* Was this parsed correctly? */
    } flags;
    bool mayUseConnection() const {return mayUseConnection_;}

    void mayUseConnection(bool aBool) {
        mayUseConnection_ = aBool;
        debug (33,3)("ClientSocketContext::mayUseConnection: This %p marked %d\n",
                     this, aBool);
    }

    class DeferredParams
    {

    public:
        clientStreamNode *node;
        HttpReply *rep;
        StoreIOBuffer queuedBuffer;
    };

    DeferredParams deferredparams;
    int64_t writtenToSocket;
    void pullData();
    int64_t getNextRangeOffset() const;
    bool canPackMoreRanges() const;
    clientStream_status_t socketState();
    void sendBody(HttpReply * rep, StoreIOBuffer bodyData);
    void sendStartOfMessage(HttpReply * rep, StoreIOBuffer bodyData);
    size_t lengthToSend(Range<int64_t> const &available);
    void noteSentBodyBytes(size_t);
    void buildRangeHeader(HttpReply * rep);
    int fd() const;
    clientStreamNode * getTail() const;
    clientStreamNode * getClientReplyContext() const;
    void connIsFinished();
    void removeFromConnectionList(ConnStateData * conn);
    void deferRecipientForLater(clientStreamNode * node, HttpReply * rep, StoreIOBuffer receivedData);
    bool multipartRangeRequest() const;
    void registerWithConn();

private:
    CBDATA_CLASS(ClientSocketContext);
    void prepareReply(HttpReply * rep);
    void packRange(StoreIOBuffer const &, MemBuf * mb);
    void deRegisterWithConn();
    void doClose();
    void initiateClose(const char *reason);
    bool mayUseConnection_; /* This request may use the connection. Don't read anymore requests for now */
    bool connRegistered_;
};

/** A connection to a socket */
class ConnStateData : public BodyProducer/*, public RefCountable*/
{

public:

    ConnStateData();
    ~ConnStateData();

    void readSomeData();
    int getAvailableBufferLength() const;
    bool areAllContextsForThisConnection() const;
    void freeAllContexts();
    void readNextRequest();
    void makeSpaceAvailable();
    ClientSocketContext::Pointer getCurrentContext() const;
    void addContextToQueue(ClientSocketContext * context);
    int getConcurrentRequestCount() const;
    bool isOpen() const;

    int fd;

    /// chunk buffering and parsing algorithm state
    typedef enum { chunkUnknown, chunkNone, chunkParsing, chunkReady, chunkError } DechunkingState;

    struct In {
        In();
        ~In();
        char *addressToReadInto() const;

        ChunkedCodingParser *bodyParser; ///< parses chunked request body
        MemBuf chunked; ///< contains unparsed raw (chunked) body data
        MemBuf dechunked; ///< accumulates parsed (dechunked) content
        char *buf;
        size_t notYetUsed;
        size_t allocatedSize;
        size_t chunkedSeen; ///< size of processed or ignored raw read data
        DechunkingState dechunkingState; ///< request dechunking state
    } in;

    int64_t bodySizeLeft();

    /**
     * Is this connection based authentication? if so what type it
     * is.
     */
    auth_type_t auth_type;

    /**
     * note this is ONLY connection based because NTLM is against HTTP spec.
     * the user details for connection based authentication
     */
    AuthUserRequest *auth_user_request;

    /**
     * used by the owner of the connection, opaque otherwise
     * TODO: generalise the connection owner concept.
     */
    ClientSocketContext::Pointer currentobject;

    IpAddress peer;

    IpAddress me;

    IpAddress log_addr;
    char rfc931[USER_IDENT_SZ];
    int nrequests;

    struct {
        bool readMoreRequests;
        bool swanSang; // XXX: temporary flag to check proper cleanup
    } flags;
    struct {
        int fd;                 /* pinned server side connection */
        char *host;             /* host name of pinned connection */
        int port;               /* port of pinned connection */
        bool pinned;             /* this connection was pinned */
        bool auth;               /* pinned for www authentication */
        struct peer *peer;             /* peer the connection goes via */
        AsyncCall::Pointer closeHandler; /*The close handler for pinned server side connection*/
    } pinning;

    http_port_list *port;

    bool transparent() const;
    void transparent(bool const);
    bool reading() const;
    void reading(bool const);

    bool closing() const;
    void startClosing(const char *reason);

    BodyPipe::Pointer expectRequestBody(int64_t size);
    virtual void noteMoreBodySpaceAvailable(BodyPipe::Pointer);
    virtual void noteBodyConsumerAborted(BodyPipe::Pointer);

    void handleReadData(char *buf, size_t size);
    void handleRequestBodyData();

    /**
     * Correlate the current ConnStateData object with the pinning_fd socket descriptor.
     */
    void pinConnection(int fd, HttpRequest *request, struct peer *peer, bool auth);
    /**
     * Decorrelate the ConnStateData object from its pinned peer
     */
    void unpinConnection();
    /**
     * Checks if there is pinning info if it is valid. It can close the server side connection
     * if pinned info is not valid.
     \param request   if it is not NULL also checks if the pinning info refers to the request client side HttpRequest
     \param peer      if it is not NULL also check if the peer is the pinning peer
     \return          The fd of the server side connection or -1 if fails.
     */
    int validatePinnedConnection(HttpRequest *request, const struct peer *peer);
    /**
     * returts the pinned peer if exists, NULL otherwise
     */
    struct peer *pinnedPeer() const {return pinning.peer;}
    bool pinnedAuth() const {return pinning.auth;}

    // pining related comm callbacks
    void clientPinnedConnectionClosed(const CommCloseCbParams &io);

    // comm callbacks
    void clientReadRequest(const CommIoCbParams &io);
    void connStateClosed(const CommCloseCbParams &io);
    void requestTimeout(const CommTimeoutCbParams &params);

    // AsyncJob API
    virtual bool doneAll() const { return BodyProducer::doneAll() && false;}
    virtual void swanSong();

#if USE_SSL
    bool switchToHttps();
    bool switchedToHttps() const { return switchedToHttps_; }
#else
    bool switchedToHttps() const { return false; }
#endif

    void startDechunkingRequest(HttpParser *hp);
    bool parseRequestChunks(HttpParser *hp);
    void finishDechunkingRequest(HttpParser *hp);

private:
    int connReadWasError(comm_err_t flag, int size, int xerrno);
    int connFinishedWithConn(int size);
    void clientMaybeReadData(int do_next_read);
    void clientAfterReadingRequests(int do_next_read);

private:
    CBDATA_CLASS2(ConnStateData);
    bool transparent_;
    bool reading_;
    bool closing_;

    bool switchedToHttps_;
    BodyPipe::Pointer bodyPipe; // set when we are reading request body
};

/* convenience class while splitting up body handling */
/* temporary existence only - on stack use expected */

void setLogUri(ClientHttpRequest * http, char const *uri);

const char *findTrailingHTTPVersion(const char *uriAndHTTPVersion, const char *end = NULL);

#endif /* SQUID_CLIENTSIDE_H */
